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The MERV scale is designed to represent the worst-case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometers. The MERV value is from 1 to 16. Higher MERV values correspond to a greater percentage of particles captured on each pass, with a MERV 16 filter capturing more than 95% of particles over the full range.
MERV is a standard used to measure the overall efficiency of a filter. The MERV scale ranges from 1 to 16, and measures a filter's ability to remove particles from 10 to 0.3 micrometer in size. Filters with higher ratings not only remove more particles from the air, but they also remove smaller particles.
[4] The Facility Guidelines Institute recommends using sequential HEPA filters for ORs with a MERV rating of 7 (i.e., captures particle 10 to 3 μm in size) and 14 (i.e., captures particles from 1 to 0.3 μm in size). [5] One mechanism by which HEPA filters capture particles is electrostatic charge.
The two most common standards require that an air filter must remove (from the air that passes through) 99.95% (European Standard) [4] or 99.97% (ASME standard) [5] of particles that have a size greater than or equal to 0.3 μm.
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HE-marked filters are 99.97% efficient against 0.3 micron particles and are oil-proof. [22] [23] [24] Since filters are tested against the by definition most penetrating particle size of 0.3 μm, an APR with a P100 classification would be at least 99.97% efficient at removing particles of this size.
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